Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions		Total		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]		Retained Earnings [Member]	Treasury Stock and Other		AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total shareholders' equity		$ 23,005		$ 1,225	$ 550	$ 9,089		$ 13,295	$ (1,032)	[1]	$ (122)
Common Stock, Shares, Outstanding					525,000
Net Income (Loss) Attributable to Parent		1,449						1,449
Other Comprehensive Income (Loss), Net of Tax		34									34
Noncontrolling Interest, Period Increase (Decrease)		(2)							(2)
Dividends, Common Stock, Cash		(352)						(352)
Dividends, Preferred Stock, Cash	[2]	(48)						(48)
Treasury Stock, Shares, Acquired					(11,000)
Treasury Stock, Value, Acquired, Cost Method		(465)							(465)
Payments for Repurchase of Warrants		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					0
Stock Issued During Period, Value, Stock Options Exercised		(9)				(16)			(25)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		18				14		(3)	7
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		13							13
Stock Issued During Period, Shares, Employee Benefit Plan					0
Stock Issued During Period, Value, Employee Benefit Plan		3				0			3
Total shareholders' equity		23,664		1,225	$ 550	9,087		14,341	(1,451)	[1]	(88)
Common Stock, Shares, Outstanding					514,000
Total shareholders' equity		$ 23,437		1,225	$ 550	9,094		14,686	(1,658)	[1]	(460)
Common Stock, Shares, Outstanding		508,712	[3]		509,000
Cumulative effect of credit risk adjustment	[4]	$ 0						5			(5)	[5]
Net Income (Loss) Attributable to Parent		1,413						1,413
Other Comprehensive Income (Loss), Net of Tax		580									580
Noncontrolling Interest, Period Increase (Decrease)		(7)							(7)
Dividends, Common Stock, Cash		(370)						(370)
Dividends, Preferred Stock, Cash	[2]	(49)						(49)
Treasury Stock, Shares, Acquired					(15,000)
Treasury Stock, Value, Acquired, Cost Method		(566)							(566)
Payments for Repurchase of Warrants		(24)				(24)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					1,000
Stock Issued During Period, Value, Stock Options Exercised		(15)	[6]			(28)	[6]		(43)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					1,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		18	[6]			(33)	[6]	(4)	55
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		2							2
Total shareholders' equity		$ 24,449		$ 1,225	$ 550	$ 9,009		$ 15,681	$ (2,131)	[1]	$ 115
Common Stock, Shares, Outstanding		495,936	[3]		496,000

[1] At September 30, 2016, includes ($2,232) million for treasury stock, $0 million for the compensation element of restricted stock, and $101 million for noncontrolling interest.At September 30, 2015, includes ($1,550) million for treasury stock, ($7) million for the compensation element of restricted stock, and $106 million for noncontrolling interest.

[2] For the nine months ended September 30, 2016, dividends were $3,056 per share for both Perpetual Preferred Stock Series A and B, $4,406 per share for Perpetual Preferred Stock Series E, and $4,219 per share for Perpetual Preferred Stock Series F.For the nine months ended September 30, 2015, dividends were $3,044 per share for both Perpetual Preferred Stock Series A and B, $4,406 per share for Perpetual Preferred Stock Series E, and $4,813 per share for Perpetual Preferred Stock Series F.

[3] Includes restricted shares of 21 thousand and 1,334 thousand at September 30, 2016 and December 31, 2015, respectively.

[4] Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk, beginning January 1, 2016. See Note 1, "Significant Accounting Policies," and Note 17, "Accumulated Other Comprehensive Income/(Loss)," for additional information.

[5] Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk. See Note 1, "Significant Accounting Policies," for additional information.

[6] Includes a ($4) million net reclassification of excess tax benefits from additional paid-in capital to provision for income taxes, related to the Company's early adoption of ASU 2016-09. See Note 1, "Significant Accounting Policies," and Note 11, "Employee Benefit Plans," for additional information.